linux-kernel - [PATCH v3 06/32] selftests: harness: Remove dependency on libatomic

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Message-Id: <20250411-nolibc-kselftest-harness-v3-6-4d9c0295893f@linutronix.de>
Date: Fri, 11 Apr 2025 11:00:30 +0200
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Shuah Khan <shuah@...nel.org>, Shuah Khan <skhan@...uxfoundation.org>, 
 Willy Tarreau <w@....eu>, 
 Thomas Weißschuh <linux@...ssschuh.net>, 
 Kees Cook <kees@...nel.org>
Cc: Andy Lutomirski <luto@...capital.net>, Will Drewry <wad@...omium.org>, 
 linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH v3 06/32] selftests: harness: Remove dependency on
 libatomic

__sync_bool_compare_and_swap() is deprecated and requires libatomic on
GCC. Compiler toolchains don't necessarily have libatomic available, so
avoid this requirement by using atomics that don't need libatomic.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 tools/testing/selftests/kselftest_harness.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/kselftest_harness.h b/tools/testing/selftests/kselftest_harness.h
index 222a4f51a8d704c41597e09a241ad887ef787139..7ec4f66d0e3d7f129f6c2a45ff58310dabe5d03f 100644
--- a/tools/testing/selftests/kselftest_harness.h
+++ b/tools/testing/selftests/kselftest_harness.h
@@ -439,12 +439,12 @@
 		} \
 		if (child == 0) { \
 			if (_metadata->setup_completed && !fixture_name##_teardown_parent && \
-					__sync_bool_compare_and_swap(teardown, false, true)) \
+					!__atomic_test_and_set(teardown, __ATOMIC_RELAXED)) \
 				fixture_name##_teardown(_metadata, self, variant->data); \
 			_exit(0); \
 		} \
 		if (_metadata->setup_completed && fixture_name##_teardown_parent && \
-				__sync_bool_compare_and_swap(teardown, false, true)) \
+				!__atomic_test_and_set(teardown, __ATOMIC_RELAXED)) \
 			fixture_name##_teardown(_metadata, self, variant->data); \
 		munmap(teardown, sizeof(*teardown)); \
 		if (self && fixture_name##_teardown_parent) \

-- 
2.49.0